Device for aiding the hearing.



M. FRIEDMAN.

DEVICE FOR AIDING THE HEARING.

APPLICATION FILED MAR. 3|. 1916.

1,21,55Q. Patented 001;. 15, 1918.

W 7 mm Mamm- 351 @Hozmcq an orc.

MORRIS FRIEDMAN, BROOKLYN,

NEW YORK.

DEVICE- FOR AIDING THE HEARING.

To all whom it may concern:

Be it known that I, MORRIS formerly a subject tria, having declared myintention of becoming a citizen of the United States, and residing inthe borough of Brooklyn, city of ew York, county of Kings, and State ofNew York, have invented certain new and useful Improvements in Devicesfor Aiding the Hearing, of which the following is a specification.

FRIEDMAN,

invention relates to a device for aiding the hearing and it belongs tothe class of microphonic electric devices used by pe sons who are hardof hearing or partially deaf in order to aid them in hearing. The 7present invention relates more particularly to the instrument whereinthe sound waves are translated into electrical pulsat1ons,'or

to the instrument commonly ca transmitter.

The object of my invention is to provide a device of this character lledthe electrical pulsations in of louder reproduction in the reproducer,so that the device will be more efiicient than those heretofore made.Another object of my invention is to provide a device which will renderthe reproductions of sounds clearer and more'natural or more nearly likethe actual sounds which act upon the transmitter. These results areaccom lished by arranging the sound passages in the transmitter in anovel manner.

In the drawings forming part of this application,

Figure 1 is a sectional view through the middle of a transmittinginstrument made in accordance with my invention, and in which view, thecircuit is shown diagrammatically.

Fig. 2 is an enlarged sectional view of a portion of the diaphragm andits casing.

Fig. 3 is a sectional view, taken on the line 33 of Fig. 1,

Fi 4 is a sectional view on the line H of Fig. 1, and

Fig. 5 is a face view of the ing at the front.

device, look- Fig. 6 is a detail view. The device consists principallyof a microphonic part including a diaphra, and sound receiving andconducting parts. The outer member or container consists o a casing orshell 1 which comprises a rear Specification of Letters Yatent.

of the Emperor of Aus- I which will be more sensitive to sounds andwhich will causethe circuit capable Patented Oct. 15, 1918.

Application ma mun :nf, 191a Serial m. 87,900.

wall 2 having an opening to receive therein the rheostat 3, which seatson the rabbet 4:, of a flange 5 around the outer edge of the wall 2; andof a second member 6 comprising a front wall 7 and a flange 8 around itsedge. The flange 8 slides over or telescopes in relation to the flange 5when the parts are assembled, so that the members 1 and 6 form aninclosure or sound chamber. The front wall 7 has one or more aperture 9disposed at or near its central portion, and these apertures are hereshown as countersunk, with the larger portion to the outside. The casingmembers inclose the microphonic device.

There is an interior shell or box 10 consists of front which haveflanges 11, 12 and whichlatter are threaded, so that one screws into theother so that the two shell members when united form an interiorchamber. The front member has a front wall 13, to which the carbon cup14: is fastened by means of a screw 15 passing through the wall. Thiswall 13 is otherwise imperforate, or at least it is made so that soundwaves may reflect upon'it but no apertures are provided for the sound topass directly therethrough.

A diaphragm 16, preferably of the same material that diaphragms of thischaracter are made of, is clamped against the member 17 by the flange 12act'ng on its edge, and T have shown a paper washer 18 lying against thediaphragm edge known. 7

,The pockets 19 in the carbon cup are partly lled with small, loosecarbon balls 20 which form in well known manner, a microhonic connectionbetween the cup 14: and the diaphragm.

The rear wall 21 of the inner casing or shell 17, has perforations 22 inthe form of an annular ring near the outer edge of which for purposes wethe wall and these are preferably drilled on angles oblique to the planeof the wall, as shown in the drawing.

The rheostat 3 consists of an insulating support or disk which sets inthe aperture in the wall 2 and flush with the outer surface of the wall;of coils of wire (not shown) ofiering different resistances to the flowof current in the circuit, according to how many such coils areconnected in the circuit; and of contact points 23 connected with theseveral d with which points coils an the switch lever 24: cooperates.There is a position with the screws bushing Binding posts 29, on thecasing memare adapted to be connected in series in a circuit whichincludes a source of current, such as the battery 31 and a receiver 32.The l comprise any well tion with the diaphragm. The circuit is theusual one employed in devices- 1 so that further description thereof isnot lated b necessary here.

The device herein shown is generally hung or worn on the person using itso that the diaphragm is in substantially a Vertical plane in order thatthe microphone will be most sensitive to sound. If worn against thebody, the wall 7 will be turned away from the body in order that thesound waves may freely enter the apertures 9 in the central portion ofthe wall.

s the sound waves enter the apertures 9 they spread out laterally andpass through the space 37 formed between the walls 13 and 7. They thenpass through the space 38 formed between the edge of the inner shell andthe outer casing, and enter the space 39 between the rear wall 2 and therear wall 21 of the inner shell. From there the waves pass through theannular ring of apertures 22 and then act u phragm. It is understood, 0course, that the movements of the diaphragm are transy the microphonicelectrical pulsations which pass through the connection intocircuit andare translated into soundwaves 1n the receiver.

I find that the improved results are accomplishe to a great extent bytaking the and same at the spaces 37, 38 and 39. The reimproved also byarranging the dedevice is not necesis required. invention, what I inhavin a sound receivin o enln censhell spaced from said outer casing asoun space expanding laterally from said sound receivin said inner sheI, a dia ragm in said inner Signed at the city, county and State of NewYork, this 24th day of March, 1916.

MORRIS FRIEDMAN.

e results were muchiinferior he inner shell and outer shell is theopening and passing around

